Department of Chemical Engineering, Imperial College London, London, UK.
Langmuir. 2012 Aug 7;28(31):11433-9. doi: 10.1021/la3019088. Epub 2012 Jul 23.
Recent experiments on the evaporation of sessile droplets have revealed the spontaneous formation of various patterns including the presence of hydrothermal waves. These waves had previously been observed, in the absence of evaporation, in thin liquid layers subjected to an imposed, uniform temperature gradient. This is in contrast to the evaporating droplet case wherein these gradients arise naturally due to evaporation and are spatially and temporally varying. In the present paper, we present a theory of evaporating sessile droplets deposited on a heated surface and propose a candidate mechanism for the observed pattern formation using a linear stability analysis in the quasi-steady-state approximation. A qualitative agreement with experimental trends is observed.
最近关于固着液滴蒸发的实验揭示了各种图案的自发形成，包括热液波的存在。这些波以前在没有蒸发的情况下，在受到强制均匀温度梯度的薄液层中被观察到。这与蒸发液滴的情况形成对比，在蒸发液滴的情况下，由于蒸发，这些梯度是自然产生的，并且是空间和时间变化的。在本文中，我们提出了一个关于在加热表面上沉积的固着液滴的理论，并使用准稳态近似中的线性稳定性分析提出了观察到的图案形成的候选机制。观察到与实验趋势的定性一致。
